Environment: Linux x86_64, web dev app, Codex CLI 0.163.0, GPT-6.1-Sol
App commit: 70e5e384da
Server: vp run dev in /home/ubuntu/wt/issue-19124; isolated .t3; web port 7117, server port 15157
Fixture: git init -b main /tmp/issue-19124-repo; empty initial commit
Browser: UI Add project /tmp/issue-19124-repo, New worktree, Codex GPT-6.1-Sol
1. Send 'Reply exactly READY. Do not use tools or modify files.' => READY
Managed path: /home/ubuntu/wt/issue-19124/.t3/worktrees/issue-19124-repo/t3-0223e59a
Branch auto-renamed to t3/reply-ready
2. git -C <managed path> commit --allow-empty -m 'Fixture completed work'
   git -C /tmp/issue-19124-repo merge --ff-only t3/reply-ready
   git -C /tmp/issue-19124-repo worktree remove <managed path>
   git -C /tmp/issue-19124-repo branch -d t3/reply-ready
3. Send 'Reply exactly AFTER_CLEANUP. Do not use tools or modify files.' => Failed
   UI: Provider session failed to open
   This thread's workspace folder no longer exists or is not a directory: <managed path>. Restore the folder at this path before retrying.
4. Send 'Reply exactly RETRY. Do not use tools or modify files.' => same failure
5. git -C /tmp/issue-19124-repo branch t3/reply-ready main
   (Do not restore directory manually.)
6. Send 'Reply exactly RESTORED_BRANCH. Do not use tools or modify files.' => RESTORED_BRANCH
   Server automatically recreates the managed worktree when branch exists.
Relevant server log excerpts:
[22:32:05.752] WARN (#9827): provider turn start recreating missing worktree
  {
    threadId: '471e598c-a768-4b3b-b169-e181fe837128',
    worktreePath: '/home/ubuntu/wt/issue-19124/.t3/worktrees/issue-19124-repo/t3-0223e59a',
    branch: 't3/reply-ready'
  }
[22:32:05.882] WARN (#9827): provider turn start failed to recreate worktree
  {
    threadId: '471e598c-a768-4b3b-b169-e181fe837128',
    worktreePath: '/home/ubuntu/wt/issue-19124/.t3/worktrees/issue-19124-repo/t3-0223e59a',
    cause: 'GitCommandError: Git command failed in GitVcsDriver.createWorktree (/tmp/issue-19124-repo): git worktree add failed (ref_not_found)\n' +
      '    at file:///home/ubuntu/wt/issue-19124/apps/server/src/vcs/GitVcsDriverCore.ts:1147:11\n' +
[22:32:06.012] WARN (#9912): provider turn start recreating missing worktree
  {
    threadId: '471e598c-a768-4b3b-b169-e181fe837128',
    worktreePath: '/home/ubuntu/wt/issue-19124/.t3/worktrees/issue-19124-repo/t3-0223e59a',
    branch: 't3/reply-ready'
  }
[22:32:06.109] WARN (#9912): provider turn start failed to recreate worktree
  {
    threadId: '471e598c-a768-4b3b-b169-e181fe837128',
    worktreePath: '/home/ubuntu/wt/issue-19124/.t3/worktrees/issue-19124-repo/t3-0223e59a',
    cause: 'GitCommandError: Git command failed in GitVcsDriver.createWorktree (/tmp/issue-19124-repo): git worktree add failed (ref_not_found)\n' +
      '    at file:///home/ubuntu/wt/issue-19124/apps/server/src/vcs/GitVcsDriverCore.ts:1147:11\n' +
[22:32:06.327] WARN (#9977): provider turn start recreating missing worktree
  {
    threadId: '471e598c-a768-4b3b-b169-e181fe837128',
    worktreePath: '/home/ubuntu/wt/issue-19124/.t3/worktrees/issue-19124-repo/t3-0223e59a',
    branch: 't3/reply-ready'
  }
[22:32:06.450] WARN (#9977): provider turn start failed to recreate worktree
  {
    threadId: '471e598c-a768-4b3b-b169-e181fe837128',
    worktreePath: '/home/ubuntu/wt/issue-19124/.t3/worktrees/issue-19124-repo/t3-0223e59a',
    cause: 'GitCommandError: Git command failed in GitVcsDriver.createWorktree (/tmp/issue-19124-repo): git worktree add failed (ref_not_found)\n' +
      '    at file:///home/ubuntu/wt/issue-19124/apps/server/src/vcs/GitVcsDriverCore.ts:1147:11\n' +